Baby paranoia

Anyone with multiple kids help me out here. So I'm a first time mom. My son was born March 1st and I am paranoid about everything. And I know part of that is being a first time mom, but I also know alot of it is just ridiculous. For example, we we're at the grocery store and my LO was hungry so my SO was walking down the aisles feeding him his bottle. I almost had an anxiety attack. I swore someone was going to number into him and he was going to fall with the baby. Way far fetched, I know. But I made him stop and stand there to feed him because I was so freaked out. Not to mention my SO works out of town Sunday night through Friday night. So it's just me and the baby. I lock all three locks on both doors 24/7. We live in the country not a bad town. But I'm so scared all the sudden. It's almost physically exhausting to worry 24/7. Any ideas or is it normal?